气液逆流接触过程及液滴夹带特性  

Characteristics of gas-liquid countercurrent contact processes and droplet entrainment

作　　者：白翔宇 王建军[1] 杜明生 郑官军 于定嵘 刘宏宇[1] 刘帅[1] BAI Xiang-yu;WANG Jian-jun;DU Ming-sheng;ZHENG Guan-jun;YU Ding-rong;LIU Hong-yu;LIU Shuai(College of New Energy,China University of Petroleum East China,Qingdao 266580,China;Datang Environment Industry Group Co.Ltd.,Beijing 100097,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580 [2]大唐环境产业集团股份有限公司,北京100097

出　　处：《高校化学工程学报》2019年第6期1344-1353,共10页Journal of Chemical Engineering of Chinese Universities

摘　　要：为了探究喷淋塔内气液逆流接触流动特点及液滴夹带特性,采用激光粒度仪及湿法等动取样对实验模型内液滴粒径分布及含液率进行测量,并结合高速摄影技术对喷淋液层气液两相流动特性进行跟踪拍摄。结果表明:根据气液逆流接触特点可将液层流动分为波动区、破碎区及夹带区;截面气速及液相体积流量的增大使得气液间作用力增强,夹带液滴粒径减小;由于碰撞作用双层喷淋下夹带液滴粒径相对于单层喷淋下较小;液滴在上行过程中运动复杂且多变,液滴的不规则运动及气相流场的复杂性是造成夹带区内液滴粒径分布波动的主要原因;定量得出气液逆流接触过程受气相夹带液滴粒径分布范围,研究结果可为喷淋塔内传质及传热过程提供参考,同时可为除雾器的开发提供设计依据。Gas-liquid countercurrent contact and droplets entrainment characteristics in spray tower were studied, and particle size distribution and liquid contents in the experimental model were measured by laser particle size analyzer and wet sampling. Moreover, the gas-liquid flow characteristics were also tracked by high-speed photography. The results show that the liquid layer can be divided into fluctuation area, broken area and entrained area based on the gas-liquid countercurrent contact characteristics. With the increase of the air velocity and the liquid volume flow, the gas-liquid force became more intense and the entrained droplet particle size decreased. The entrained droplets under double-layer spray were smaller than the single-layer spray due to collision. The movements of the droplets in the upward process were complicated, which was mainly caused by the irregular motions of droplets and complexity of gas phase flow field. The results quantitatively provide the distribution range of the entrained droplets. This study is helpful in the study of mass and heat transfer processes of wet flue gas desulphurization and demister design.

关 键 词：多相流 气液逆流接触 液滴夹带 粒径分布 

分 类 号：TQ[化学工程]